Re: [PATCH 1/3] tg3: Limit minimum tx queue wakeup threshold

From: Michael Chan
Date: Tue Aug 19 2014 - 18:01:40 EST


On Tue, 2014-08-19 at 11:52 -0700, Benjamin Poirier wrote:
> diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> index 3ac5d23..b11c0fd 100644
> --- a/drivers/net/ethernet/broadcom/tg3.c
> +++ b/drivers/net/ethernet/broadcom/tg3.c
> @@ -202,7 +202,8 @@ static inline void _tg3_flag_clear(enum TG3_FLAGS flag, unsigned long *bits)
> #endif
>
> /* minimum number of free TX descriptors required to wake up TX process */
> -#define TG3_TX_WAKEUP_THRESH(tnapi) ((tnapi)->tx_pending / 4)
> +#define TG3_TX_WAKEUP_THRESH(tnapi) max_t(u32, (tnapi)->tx_pending / 4, \
> + MAX_SKB_FRAGS + 1)

I think we should precompute this and store it in something like
tp->tx_wake_thresh.

> #define TG3_TX_BD_DMA_MAX_2K 2048
> #define TG3_TX_BD_DMA_MAX_4K 4096
>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/